rcarsey
Well Known Member
I've posted this in the RV12 Facebook group, and by Rotax-Owner's request, also the Rotax-Owner FB group too.. sorry if you've already seen this.
During my pre-Oshkosh oil change and inspections, I found that the connector from the generator to Regulator B (the one on the top of the fuse box) was overheating. This is apparently a common problem and Rotax had issued a Service Instruction (SI-912 i-024) about "optionally" replacing it. Of course, they didn't tell you that they undersized the connectors (TI's DT series; 7.5A).. all newer engines come with a different connector (Amphenol round connector mentioned in the SI).
IF you have a 912iS engine with the grey/square connector on Regulator B (top), then I suggest you take a closer look. There were no obvious symptoms other than light/intermittent radio noise that could easily be ignored. The SI will have you change to Rotax-provided parts for $500 (the round Amphenol connector), but I decided to stick with similar square connector (Amphenol ATP series) (similar to TI's DTP series.. just a bigger size that handles 25A).
For those interested, the Digi-Key shopping cart ($13) is here: https://www.digikey.com/short/tj93p0jd
Crimper tool for 12-gauge wire ($32): https://www.amazon.com/dp/B07V1V6HJ4/?th=1
And of course, if anyone wants to borrow the crimper tool ($5 shipping each way), you're more than welcome to.
*Note: I haven't received these parts yet, so I can't say anything about implementing this particular fix, but it seems easy enough and there's plenty of slack on both ends of the wires
During my pre-Oshkosh oil change and inspections, I found that the connector from the generator to Regulator B (the one on the top of the fuse box) was overheating. This is apparently a common problem and Rotax had issued a Service Instruction (SI-912 i-024) about "optionally" replacing it. Of course, they didn't tell you that they undersized the connectors (TI's DT series; 7.5A).. all newer engines come with a different connector (Amphenol round connector mentioned in the SI).
IF you have a 912iS engine with the grey/square connector on Regulator B (top), then I suggest you take a closer look. There were no obvious symptoms other than light/intermittent radio noise that could easily be ignored. The SI will have you change to Rotax-provided parts for $500 (the round Amphenol connector), but I decided to stick with similar square connector (Amphenol ATP series) (similar to TI's DTP series.. just a bigger size that handles 25A).
For those interested, the Digi-Key shopping cart ($13) is here: https://www.digikey.com/short/tj93p0jd
Crimper tool for 12-gauge wire ($32): https://www.amazon.com/dp/B07V1V6HJ4/?th=1
And of course, if anyone wants to borrow the crimper tool ($5 shipping each way), you're more than welcome to.
*Note: I haven't received these parts yet, so I can't say anything about implementing this particular fix, but it seems easy enough and there's plenty of slack on both ends of the wires
